Base Converter — Binary, Octal, Decimal, Hex & Custom

Paste or type a number to convert between bases 2–36. Exact big-int math for integers, fractional support with precision, and a powerful bulk mode.

Input
Mode
Number
Input base
Advance Controls
Detected base
Common bases
Binary
Octal
Decimal
Hex
Base 36

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What you can do

  • Convert between bases 2–36 (binary, octal, decimal, hex, etc.)
  • Auto-detect base from prefix or digits
  • Format outputs with 0b/0o/0x, uppercase, and digit grouping
  • Handle fractional inputs with configurable precision
  • Bulk-convert many numbers and export CSV
  • View signed value for a given two’s-complement bit width

Frequently Asked Questions (FAQs)

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